CN108705830A - A kind of acoustical cotton and preparation method thereof of density gradient distribution - Google Patents

A kind of acoustical cotton and preparation method thereof of density gradient distribution Download PDF

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Publication number
CN108705830A
CN108705830A CN201810219364.7A CN201810219364A CN108705830A CN 108705830 A CN108705830 A CN 108705830A CN 201810219364 A CN201810219364 A CN 201810219364A CN 108705830 A CN108705830 A CN 108705830A
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China
Prior art keywords
acoustical cotton
needle
density gradient
layer
gradient distribution
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CN201810219364.7A
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Chinese (zh)
Inventor
王小龙
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SUZHOU SHENBO AUTO PARTS Co Ltd
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SUZHOU SHENBO AUTO PARTS Co Ltd
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Priority to CN201810219364.7A priority Critical patent/CN108705830A/en
Publication of CN108705830A publication Critical patent/CN108705830A/en
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    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B32—LAYERED PRODUCTS
    • B32B—LAYERED PRODUCTS, i.e. PRODUCTS BUILT-UP OF STRATA OF FLAT OR NON-FLAT, e.g. CELLULAR OR HONEYCOMB, FORM
    • B32B5/00—Layered products characterised by the non- homogeneity or physical structure, i.e. comprising a fibrous, filamentary, particulate or foam layer; Layered products characterised by having a layer differing constitutionally or physically in different parts
    • B32B5/02—Layered products characterised by the non- homogeneity or physical structure, i.e. comprising a fibrous, filamentary, particulate or foam layer; Layered products characterised by having a layer differing constitutionally or physically in different parts characterised by structural features of a fibrous or filamentary layer
    • B32B5/08—Layered products characterised by the non- homogeneity or physical structure, i.e. comprising a fibrous, filamentary, particulate or foam layer; Layered products characterised by having a layer differing constitutionally or physically in different parts characterised by structural features of a fibrous or filamentary layer the fibres or filaments of a layer being of different substances, e.g. conjugate fibres, mixture of different fibres
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B32—LAYERED PRODUCTS
    • B32B—LAYERED PRODUCTS, i.e. PRODUCTS BUILT-UP OF STRATA OF FLAT OR NON-FLAT, e.g. CELLULAR OR HONEYCOMB, FORM
    • B32B37/00—Methods or apparatus for laminating, e.g. by curing or by ultrasonic bonding
    • B32B37/02—Methods or apparatus for laminating, e.g. by curing or by ultrasonic bonding characterised by a sequence of laminating steps, e.g. by adding new layers at consecutive laminating stations
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B32—LAYERED PRODUCTS
    • B32B—LAYERED PRODUCTS, i.e. PRODUCTS BUILT-UP OF STRATA OF FLAT OR NON-FLAT, e.g. CELLULAR OR HONEYCOMB, FORM
    • B32B37/00—Methods or apparatus for laminating, e.g. by curing or by ultrasonic bonding
    • B32B37/08—Methods or apparatus for laminating, e.g. by curing or by ultrasonic bonding characterised by the cooling method
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B32—LAYERED PRODUCTS
    • B32B—LAYERED PRODUCTS, i.e. PRODUCTS BUILT-UP OF STRATA OF FLAT OR NON-FLAT, e.g. CELLULAR OR HONEYCOMB, FORM
    • B32B38/00—Ancillary operations in connection with laminating processes
    • B32B38/18—Handling of layers or the laminate
    • B32B38/1808—Handling of layers or the laminate characterised by the laying up of the layers
    • B32B38/1816—Cross feeding of one or more of the layers
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B32—LAYERED PRODUCTS
    • B32B—LAYERED PRODUCTS, i.e. PRODUCTS BUILT-UP OF STRATA OF FLAT OR NON-FLAT, e.g. CELLULAR OR HONEYCOMB, FORM
    • B32B5/00—Layered products characterised by the non- homogeneity or physical structure, i.e. comprising a fibrous, filamentary, particulate or foam layer; Layered products characterised by having a layer differing constitutionally or physically in different parts
    • B32B5/02—Layered products characterised by the non- homogeneity or physical structure, i.e. comprising a fibrous, filamentary, particulate or foam layer; Layered products characterised by having a layer differing constitutionally or physically in different parts characterised by structural features of a fibrous or filamentary layer
    • B32B5/022—Non-woven fabric
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B32—LAYERED PRODUCTS
    • B32B—LAYERED PRODUCTS, i.e. PRODUCTS BUILT-UP OF STRATA OF FLAT OR NON-FLAT, e.g. CELLULAR OR HONEYCOMB, FORM
    • B32B5/00—Layered products characterised by the non- homogeneity or physical structure, i.e. comprising a fibrous, filamentary, particulate or foam layer; Layered products characterised by having a layer differing constitutionally or physically in different parts
    • B32B5/02—Layered products characterised by the non- homogeneity or physical structure, i.e. comprising a fibrous, filamentary, particulate or foam layer; Layered products characterised by having a layer differing constitutionally or physically in different parts characterised by structural features of a fibrous or filamentary layer
    • B32B5/028—Net structure, e.g. spaced apart filaments bonded at the crossing points
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B32—LAYERED PRODUCTS
    • B32B—LAYERED PRODUCTS, i.e. PRODUCTS BUILT-UP OF STRATA OF FLAT OR NON-FLAT, e.g. CELLULAR OR HONEYCOMB, FORM
    • B32B5/00—Layered products characterised by the non- homogeneity or physical structure, i.e. comprising a fibrous, filamentary, particulate or foam layer; Layered products characterised by having a layer differing constitutionally or physically in different parts
    • B32B5/02—Layered products characterised by the non- homogeneity or physical structure, i.e. comprising a fibrous, filamentary, particulate or foam layer; Layered products characterised by having a layer differing constitutionally or physically in different parts characterised by structural features of a fibrous or filamentary layer
    • B32B5/06—Layered products characterised by the non- homogeneity or physical structure, i.e. comprising a fibrous, filamentary, particulate or foam layer; Layered products characterised by having a layer differing constitutionally or physically in different parts characterised by structural features of a fibrous or filamentary layer characterised by a fibrous or filamentary layer mechanically connected, e.g. by needling to another layer, e.g. of fibres, of paper
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B32—LAYERED PRODUCTS
    • B32B—LAYERED PRODUCTS, i.e. PRODUCTS BUILT-UP OF STRATA OF FLAT OR NON-FLAT, e.g. CELLULAR OR HONEYCOMB, FORM
    • B32B5/00—Layered products characterised by the non- homogeneity or physical structure, i.e. comprising a fibrous, filamentary, particulate or foam layer; Layered products characterised by having a layer differing constitutionally or physically in different parts
    • B32B5/22—Layered products characterised by the non- homogeneity or physical structure, i.e. comprising a fibrous, filamentary, particulate or foam layer; Layered products characterised by having a layer differing constitutionally or physically in different parts characterised by the presence of two or more layers which are next to each other and are fibrous, filamentary, formed of particles or foamed
    • B32B5/24—Layered products characterised by the non- homogeneity or physical structure, i.e. comprising a fibrous, filamentary, particulate or foam layer; Layered products characterised by having a layer differing constitutionally or physically in different parts characterised by the presence of two or more layers which are next to each other and are fibrous, filamentary, formed of particles or foamed one layer being a fibrous or filamentary layer
    • B32B5/26—Layered products characterised by the non- homogeneity or physical structure, i.e. comprising a fibrous, filamentary, particulate or foam layer; Layered products characterised by having a layer differing constitutionally or physically in different parts characterised by the presence of two or more layers which are next to each other and are fibrous, filamentary, formed of particles or foamed one layer being a fibrous or filamentary layer another layer next to it also being fibrous or filamentary
    • D—TEXTILES; PAPER
    • D04—BRAIDING; LACE-MAKING; KNITTING; TRIMMINGS; NON-WOVEN FABRICS
    • D04H—MAKING TEXTILE FABRICS, e.g. FROM FIBRES OR FILAMENTARY MATERIAL; FABRICS MADE BY SUCH PROCESSES OR APPARATUS, e.g. FELTS, NON-WOVEN FABRICS; COTTON-WOOL; WADDING ; NON-WOVEN FABRICS FROM STAPLE FIBRES, FILAMENTS OR YARNS, BONDED WITH AT LEAST ONE WEB-LIKE MATERIAL DURING THEIR CONSOLIDATION
    • D04H1/00—Non-woven fabrics formed wholly or mainly of staple fibres or like relatively short fibres
    • D04H1/40—Non-woven fabrics formed wholly or mainly of staple fibres or like relatively short fibres from fleeces or layers composed of fibres without existing or potential cohesive properties
    • D04H1/42—Non-woven fabrics formed wholly or mainly of staple fibres or like relatively short fibres from fleeces or layers composed of fibres without existing or potential cohesive properties characterised by the use of certain kinds of fibres insofar as this use has no preponderant influence on the consolidation of the fleece
    • D04H1/4382—Stretched reticular film fibres; Composite fibres; Mixed fibres; Ultrafine fibres; Fibres for artificial leather
    • D—TEXTILES; PAPER
    • D04—BRAIDING; LACE-MAKING; KNITTING; TRIMMINGS; NON-WOVEN FABRICS
    • D04H—MAKING TEXTILE FABRICS, e.g. FROM FIBRES OR FILAMENTARY MATERIAL; FABRICS MADE BY SUCH PROCESSES OR APPARATUS, e.g. FELTS, NON-WOVEN FABRICS; COTTON-WOOL; WADDING ; NON-WOVEN FABRICS FROM STAPLE FIBRES, FILAMENTS OR YARNS, BONDED WITH AT LEAST ONE WEB-LIKE MATERIAL DURING THEIR CONSOLIDATION
    • D04H1/00—Non-woven fabrics formed wholly or mainly of staple fibres or like relatively short fibres
    • D04H1/40—Non-woven fabrics formed wholly or mainly of staple fibres or like relatively short fibres from fleeces or layers composed of fibres without existing or potential cohesive properties
    • D04H1/44—Non-woven fabrics formed wholly or mainly of staple fibres or like relatively short fibres from fleeces or layers composed of fibres without existing or potential cohesive properties the fleeces or layers being consolidated by mechanical means, e.g. by rolling
    • D04H1/46—Non-woven fabrics formed wholly or mainly of staple fibres or like relatively short fibres from fleeces or layers composed of fibres without existing or potential cohesive properties the fleeces or layers being consolidated by mechanical means, e.g. by rolling by needling or like operations to cause entanglement of fibres
    • D04H1/48—Non-woven fabrics formed wholly or mainly of staple fibres or like relatively short fibres from fleeces or layers composed of fibres without existing or potential cohesive properties the fleeces or layers being consolidated by mechanical means, e.g. by rolling by needling or like operations to cause entanglement of fibres in combination with at least one other method of consolidation
    • D04H1/485—Non-woven fabrics formed wholly or mainly of staple fibres or like relatively short fibres from fleeces or layers composed of fibres without existing or potential cohesive properties the fleeces or layers being consolidated by mechanical means, e.g. by rolling by needling or like operations to cause entanglement of fibres in combination with at least one other method of consolidation in combination with weld-bonding
    • D—TEXTILES; PAPER
    • D06—TREATMENT OF TEXTILES OR THE LIKE; LAUNDERING; FLEXIBLE MATERIALS NOT OTHERWISE PROVIDED FOR
    • D06C—FINISHING, DRESSING, TENTERING OR STRETCHING TEXTILE FABRICS
    • D06C7/00—Heating or cooling textile fabrics
    • G—PHYSICS
    • G10—MUSICAL INSTRUMENTS; ACOUSTICS
    • G10K—SOUND-PRODUCING DEVICES; METHODS OR DEVICES FOR PROTECTING AGAINST, OR FOR DAMPING, NOISE OR OTHER ACOUSTIC WAVES IN GENERAL; ACOUSTICS NOT OTHERWISE PROVIDED FOR
    • G10K11/00—Methods or devices for transmitting, conducting or directing sound in general; Methods or devices for protecting against, or for damping, noise or other acoustic waves in general
    • G10K11/16—Methods or devices for protecting against, or for damping, noise or other acoustic waves in general
    • G10K11/162—Selection of materials
    • G10K11/168—Plural layers of different materials, e.g. sandwiches
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B32—LAYERED PRODUCTS
    • B32B—LAYERED PRODUCTS, i.e. PRODUCTS BUILT-UP OF STRATA OF FLAT OR NON-FLAT, e.g. CELLULAR OR HONEYCOMB, FORM
    • B32B2250/00—Layers arrangement
    • B32B2250/20—All layers being fibrous or filamentary
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B32—LAYERED PRODUCTS
    • B32B—LAYERED PRODUCTS, i.e. PRODUCTS BUILT-UP OF STRATA OF FLAT OR NON-FLAT, e.g. CELLULAR OR HONEYCOMB, FORM
    • B32B2262/00—Composition or structural features of fibres which form a fibrous or filamentary layer or are present as additives
    • B32B2262/02—Synthetic macromolecular fibres
    • B32B2262/0253—Polyolefin fibres
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B32—LAYERED PRODUCTS
    • B32B—LAYERED PRODUCTS, i.e. PRODUCTS BUILT-UP OF STRATA OF FLAT OR NON-FLAT, e.g. CELLULAR OR HONEYCOMB, FORM
    • B32B2262/00—Composition or structural features of fibres which form a fibrous or filamentary layer or are present as additives
    • B32B2262/02—Synthetic macromolecular fibres
    • B32B2262/0276—Polyester fibres
    • B32B2262/0284—Polyethylene terephthalate [PET] or polybutylene terephthalate [PBT]
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B32—LAYERED PRODUCTS
    • B32B—LAYERED PRODUCTS, i.e. PRODUCTS BUILT-UP OF STRATA OF FLAT OR NON-FLAT, e.g. CELLULAR OR HONEYCOMB, FORM
    • B32B2262/00—Composition or structural features of fibres which form a fibrous or filamentary layer or are present as additives
    • B32B2262/14—Mixture of at least two fibres made of different materials
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B32—LAYERED PRODUCTS
    • B32B—LAYERED PRODUCTS, i.e. PRODUCTS BUILT-UP OF STRATA OF FLAT OR NON-FLAT, e.g. CELLULAR OR HONEYCOMB, FORM
    • B32B2307/00—Properties of the layers or laminate
    • B32B2307/10—Properties of the layers or laminate having particular acoustical properties
    • B32B2307/102—Insulating
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B32—LAYERED PRODUCTS
    • B32B—LAYERED PRODUCTS, i.e. PRODUCTS BUILT-UP OF STRATA OF FLAT OR NON-FLAT, e.g. CELLULAR OR HONEYCOMB, FORM
    • B32B2307/00—Properties of the layers or laminate
    • B32B2307/50—Properties of the layers or laminate having particular mechanical properties
    • B32B2307/536—Hardness
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B32—LAYERED PRODUCTS
    • B32B—LAYERED PRODUCTS, i.e. PRODUCTS BUILT-UP OF STRATA OF FLAT OR NON-FLAT, e.g. CELLULAR OR HONEYCOMB, FORM
    • B32B2605/00—Vehicles
    • B32B2605/08—Cars

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  • Engineering & Computer Science (AREA)
  • Textile Engineering (AREA)
  • Mechanical Engineering (AREA)
  • Physics & Mathematics (AREA)
  • Acoustics & Sound (AREA)
  • Multimedia (AREA)
  • Nonwoven Fabrics (AREA)
  • Soundproofing, Sound Blocking, And Sound Damping (AREA)

Abstract

The invention discloses a kind of acoustical cottons and preparation method thereof of density gradient distribution, including sound absorbing layer, the sound absorbing layer is the fibrofelt that polyester fiber and polypropylene fibre are mixed to get by certain mass ratio, layer is pierced in the side of the fibrofelt with needle, the thickness of the needle thorn layer is less than the thickness of the sound absorbing layer, and the density of the acoustical cotton pierces layer from needle and successively decreases to non-needle thorn layer.The preparation method includes：（1）Shredding；（2）It combs；（3）Networking；（4）Needle pierces；（5）Dry temperature molding；（6）Post-processing.A kind of preparation method of the acoustical cotton of density gradient distribution of the present invention, continuous productive process is realized using in preparation and molding, process stabilizing, prepared acoustical cotton obtains Density Distribution by surface needling process and stair-stepping structure is presented, it is more excellent in the sound-absorbing effect of middle low-frequency range, and intensity is high, light-weight, rigidity is good, meets the design requirement of vehicle comfortableization and to the light-weighted requirement of vehicle.

Description

A kind of acoustical cotton and preparation method thereof of density gradient distribution
Technical field
The present invention relates to car acpistocs sound-absorbing material technical fields, more particularly to a kind of acoustical cotton of density gradient distribution And preparation method thereof.
Background technology
Car acpistocs acoustical cotton is mounted to automotive upholstery（Including ceiling, door-plate, hat rack, luggage case etc.）And automobile Material between vehicle body has the characteristics that sound-absorbing, heat-insulated, damping.Relatively common acoustical cotton has melt-blown cotton and needle in the prior art Pierce cotton.Wherein, it is meltblown cotton polyester material（PET）And polypropylene material（PP）Melting be scattered by way of mixed and At being primarily present following problem：1. material stiffness is poor, flexible deformation, assembly is difficult；2. product cost is high, cannot be satisfied The target unit price requirement of client；3. low frequency and intermediate frequency sound absorption qualities cannot meet client's index request.And acupuncture cotton is to use terylene Material（PET）It is mixed by a certain proportion of combing with polypropylene material (PP), is primarily present following problem：1. full range The sound absorption qualities of section are insufficient；2. weight is laid particular stress on.
Invention content
The invention mainly solves the technical problem of providing a kind of acoustical cotton and preparation method thereof of density gradient distribution, energy Enough solve the above problem existing for existing acoustical cotton.
In order to solve the above technical problems, one aspect of the present invention is：A kind of distribution of density gradient is provided Acoustical cotton, including sound absorbing layer, the sound absorbing layer are that polyester fiber and polypropylene fibre are mixed to get by certain mass ratio Layer is pierced in the side of fibrofelt, the fibrofelt with needle, and the thickness of the needle thorn layer is less than the thickness of the sound absorbing layer, the suction The density of sound cotton pierces layer from needle and successively decreases to non-needle thorn layer.
In a preferred embodiment of the present invention, the mass ratio of the polyester fiber and polypropylene fibre is 1：1.
In a preferred embodiment of the present invention, it is pasted with non-woven fabrics on the two sides of the sound absorbing layer.
In a preferred embodiment of the present invention, the non-woven fabrics is fabric hot rolled nonwoven fabrics or spunlace non-woven cloth.
In order to solve the above technical problems, another technical solution used in the present invention is：A kind of density gradient distribution is provided Acoustical cotton preparation method, include the following steps：
（1）Shredding：Polyester fiber and polypropylene fibre are subjected to shredding processing in proportion；
（2）It combs：Step（1）Fibrous material after middle shredding, which is sent, to be combed and is pre-mixed into mixing cylinder；
（3）Networking：By step（2）The middle mixed material of combing builds up net by layer heap, and it is the loose of 50~100mm that thickness, which is made, The reticular fibre felt of structure；
（4）Needle pierces：Using hook-shaped fine needle to step（3）Middle gained reticular fibre felt pierces certain depth from a face needle, makes its encryption, Obtain needle thorn semi-finished product；
（5）Dry temperature molding：By step（4）The needle thorn semi-finished product of middle gained are sent into an oven carry out heat-shaping；
（6）Post-processing：By step（5）Needle thorn semi-finished product after middle heat-shaping are cooled down, and are then carried out cutting or punching press, are obtained The acoustical cotton being distributed to the density gradient.
In a preferred embodiment of the present invention, the step（2）In, the speed of the cylinder is 1200~1600r/ min。
In a preferred embodiment of the present invention, the step（3）In, the speed of the lapping is 2.5m/s, the layer Weight be 30~40g.
In a preferred embodiment of the present invention, the step（4）In, the depth of the needle thorn is reticular fibre felt thickness 1/3~1/2, the punch frequency be 2300~2400 times/min.
In a preferred embodiment of the present invention, the step（5）In, the process conditions of the heat-shaping are：Temperature 200~280 DEG C, 90~120s of time, circulating air heat-shaping.
In a preferred embodiment of the present invention, the step（6）In, further include the step for being bonded non-woven fabrics after the cooling Suddenly；The process conditions of the cooling are：20~30 DEG C of temperature, 30~50s of time.
The beneficial effects of the invention are as follows：The preparation method of the acoustical cotton of the present invention a kind of density gradient distribution, using making Realize that continuous productive process, process stabilizing, prepared acoustical cotton obtain Density Distribution by surface needling process and be in standby and molding Existing stair-stepping structure, it is more excellent in the sound-absorbing effect of middle low-frequency range, and intensity is high, light-weight, rigidity is good, meets vehicle and relaxes The design requirement of suitableization and to the light-weighted requirement of vehicle.
Description of the drawings
Fig. 1 is a kind of dimensional structure diagram of one preferred embodiment of acoustical cotton of density gradient distribution of the present invention；
The label of each component is as follows in attached drawing：1. 2. non-woven fabrics of sound absorbing layer.
Specific implementation mode
The preferred embodiments of the present invention will be described in detail below in conjunction with the accompanying drawings, so that advantages and features of the invention energy It is easier to be readily appreciated by one skilled in the art, so as to make a clearer definition of the protection scope of the present invention.
Referring to Fig. 1, the embodiment of the present invention includes：
Embodiment 1
Present invention is disclosed a kind of acoustical cottons of density gradient distribution, including sound absorbing layer 1, the sound absorbing layer 1 are polyester fiber With polypropylene fibre with 1：Layer, the needle are pierced in the side of the fibrofelt that 1 mass ratio is mixed to get, the fibrofelt with needle The thickness for piercing layer is less than the thickness of the sound absorbing layer, and the density of the acoustical cotton pierces layer from needle and successively decreases to non-needle thorn layer.
The two sides of the acoustical cotton, i.e. needle are pierced on face and non-needle thorn face and are pasted with non-woven fabrics 2, specially black hot rolling nonwoven Cloth.Density of the density in reticular fibre felt its needle thorn face higher than non-needle thorn face.
The grammes per square metre of above-mentioned acoustical cotton is 400g/m2, thickness 20mm.
The preparation method of the acoustical cotton of above-mentioned density gradient distribution, includes the following steps：
（1）Shredding：Polyester fiber and polypropylene fibre are pressed 1:1 mass ratio carries out shredding processing；
（2）It combs：Step（1）Fibrous material after middle shredding is sent into mixing cylinder, is 1600r/min in the speed of cylinder Under conditions of combed and be pre-mixed；
（3）Networking：By step（2）The middle mixed material of combing builds up net by layer heap, and the loose structure that thickness is 50mm is made Reticular fibre felt；Wherein, the lapping（Stack networking）Speed be 2.5m/s, wherein every layer of weight be 30g；
（4）Needle pierces：Using hook-shaped fine needle, with the acupuncture speed of 2300 times/min to step（3）Middle gained reticular fibre felt is from one Face needle is pierced to the 1/2 of reticular fibre felt integral thickness, makes its encryption, obtains needle thorn semi-finished product；
（5）Dry temperature molding：By step（4）The needle thorn semi-finished product of middle gained are sent into the baking oven that height is 20mm, in circulating air Lower carry out heat-shaping；Specifically, the process conditions of the heat-shaping are：Needle pierces 220 DEG C of face temperature, and non-needle pierces face temperature 200 DEG C, heat-setting time is 90~110s；
（6）Post-processing：By step（5）Needle after middle heat-shaping pierces semi-finished product in 30 DEG C of cooling 35s, and needle thorn after the cooling period The needle thorn face and non-needle thorn face of semi-finished product are bonded one layer of black fever and mangle, and then carry out cutting or punching press, obtain the density The acoustical cotton of gradient distribution, through examining, the defects of product surface is smooth, not damaged, dirty, jackknifing and bubble is qualified production Product, storage vanning.
Embodiment 2
Present invention is disclosed a kind of acoustical cotton of density gradient distribution, including sound absorbing layer 1, the sound absorbing layer 1 is that needle thorn is encrypted Reticular fibre felt, needle pierce on face and non-needle thorn face and are pasted with non-woven fabrics 2, specially white spunlace non-woven cloth.The reticular fibre Felt is polyester fiber and polypropylene fibre with 1：The fibrofelt that 1 mass ratio is mixed to get, needle pierce the density in face higher than non- Needle pierces the density in face.
The grammes per square metre of above-mentioned acoustical cotton is 800g/m2, thickness 30mm.
The preparation method of the acoustical cotton of above-mentioned density gradient distribution, includes the following steps：
（1）Shredding：Polyester fiber and polypropylene fibre are pressed 1:1 mass ratio carries out shredding processing；
（2）It combs：Step（1）Fibrous material after middle shredding is sent into mixing cylinder, is 1200r/min in the speed of cylinder Under conditions of combed and be pre-mixed；
（3）Networking：By step（2）The middle mixed material of combing builds up net by layer heap, and the loose structure that thickness is 70mm is made Reticular fibre felt；Wherein, the lapping（Stack networking）Speed be 2.5m/s, wherein every layer of weight be 40g；
（4）Needle pierces：Using hook-shaped fine needle, with the acupuncture speed of 2400 times/min to step（3）Middle gained reticular fibre felt is from one Face needle is pierced to the 1/3 of reticular fibre felt integral thickness, makes its encryption, obtains needle thorn semi-finished product；
（5）Dry temperature molding：By step（4）The needle thorn semi-finished product of middle gained are sent into the baking oven that height is 30mm, in circulating air Lower carry out heat-shaping；Specifically, the process conditions of the heat-shaping are：Needle pierces 250 DEG C of face temperature, and non-needle pierces face temperature 230 DEG C, heat-setting time is 110~120s；
（6）Post-processing：By step（5）Needle after middle heat-shaping pierces semi-finished product in 20 DEG C of cooling 50s, and needle thorn after the cooling period The needle thorn face and non-needle thorn face of semi-finished product are bonded one layer of white spunlace non-woven cloth, then carry out cutting or punching press, obtain described The acoustical cotton of density gradient distribution, through examining, the defects of product surface is smooth, not damaged, dirty, jackknifing and bubble is qualification Product, storage vanning.
The height of above-mentioned baking oven is set according to product height.
Acoustical cotton obtained by the above method, after tested, the sound of low frequency in can effectively absorbing has full acoustic frequency sound absorption properties Can, and sound-absorbing efficiency is 85% or more.
The preparation method of the acoustical cotton of density gradient distribution of the present invention, carries out using by two kinds of fibrous materials of certain fineness Shredding mixes, and after combing networking, and the Density Distribution presentation step structure of acoustical cotton is made by technique pierce to surface needle, It is more excellent in the sound-absorbing effect of middle low-frequency range.The present invention realizes that continuous productive process, process stabilizing solve vapour in preparation and molding The problems such as middle low-frequency sound-absorbing of vehicle acoustics acoustical cotton is poor, intensity is insufficient, weight is laid particular stress on, has preferable rigidity, meets vehicle The design requirement of comfortableization and to the light-weighted requirement of vehicle.
In the description of the present invention, it should be noted that the instructions such as term "upper", "lower", "left", "right", "inner", "outside" Orientation or positional relationship be based on the orientation or positional relationship shown in the drawings or the invention product using when usually put Orientation or positional relationship, be merely for convenience of description of the present invention and simplification of the description, do not indicate or imply the indicated device Or element must have a particular orientation, with specific azimuth configuration and operation, therefore be not considered as limiting the invention. The foregoing is only a preferred embodiment of the present invention, is not intended to restrict the invention, and those skilled in the art is come It says, the invention may be variously modified and varied.All within the spirits and principles of the present invention, any modification made by is equal Replace, improve etc., it should all be included in the protection scope of the present invention.

Claims (10)

1. a kind of acoustical cotton of density gradient distribution, which is characterized in that including sound absorbing layer, the sound absorbing layer is polyester fiber and gathers Layer, the needle thorn are pierced in the side of the fibrofelt that tacryl is mixed to get by certain mass ratio, the fibrofelt with needle The thickness of layer is less than the thickness of the sound absorbing layer, and the density of the acoustical cotton pierces layer from needle and successively decreases to non-needle thorn layer.
2. the acoustical cotton of density gradient distribution according to claim 1, which is characterized in that the polyester fiber and polypropylene The mass ratio of fiber is 1：1.
3. the acoustical cotton of density gradient distribution according to claim 1, which is characterized in that pasted on the two sides of the sound absorbing layer With non-woven fabrics.
4. the acoustical cotton of density gradient distribution according to claim 3, which is characterized in that the non-woven fabrics is hot rolling nonwoven Cloth or spunlace non-woven cloth.
5. a kind of preparation method of the acoustical cotton of density gradient distribution according to any one of claims 1-4, which is characterized in that Include the following steps：
（1）Shredding：Polyester fiber and polypropylene fibre are subjected to shredding processing in proportion；
（2）It combs：Step（1）Fibrous material after middle shredding, which is sent, to be combed and is pre-mixed into mixing cylinder；
（3）Networking：By step（2）The middle mixed material of combing builds up net by layer heap, and it is the loose of 50~100mm that thickness, which is made, The reticular fibre felt of structure；
（4）Needle pierces：Using hook-shaped fine needle to step（3）Middle gained reticular fibre felt pierces certain depth from a face needle, makes its encryption, Obtain needle thorn semi-finished product；
（5）Dry temperature molding：By step（4）The needle thorn semi-finished product of middle gained are sent into an oven carry out heat-shaping；
（6）Post-processing：By step（5）Needle thorn semi-finished product after middle heat-shaping are cooled down, and are then carried out cutting or punching press, are obtained The acoustical cotton being distributed to the density gradient.
6. the preparation method of the acoustical cotton of density gradient distribution according to claim 5, which is characterized in that the step （2）In, the speed of the cylinder is 1200~1600r/min.
7. the preparation method of the acoustical cotton of density gradient distribution according to claim 5, which is characterized in that the step （3）In, the speed of the lapping is 2.5m/s, and the weight of the layer is 30~40g.
8. the preparation method of the acoustical cotton of density gradient distribution according to claim 5, which is characterized in that the step （4）In, the depth of the needle thorn is the 1/3~1/2 of reticular fibre felt thickness, and the punch frequency is 2300 times/min.
9. the preparation method of the acoustical cotton of density gradient distribution according to claim 5, which is characterized in that the step （5）In, the process conditions of the heat-shaping are：200~280 DEG C, 90~120s of time of temperature, circulating air heat-shaping.
10. the preparation method of the acoustical cotton of density gradient distribution according to claim 5, which is characterized in that the step （6）In, further include the steps that fitting non-woven fabrics after the cooling；The process conditions of the cooling are：20~30 DEG C of temperature, time 30~50s.
CN201810219364.7A 2018-03-16 2018-03-16 A kind of acoustical cotton and preparation method thereof of density gradient distribution Pending CN108705830A (en)

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Cited By (3)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
CN109825946A (en) * 2019-02-21 2019-05-31 浙江华恒复合材料有限公司 A kind of method of dry process vacuum insulation panel core material
JP2020106697A (en) * 2018-12-27 2020-07-09 ブリヂストンケービージー株式会社 Sound absorbing structure
JP7142189B1 (en) * 2021-01-26 2022-09-26 東洋紡株式会社 SOUND ABSORBING MATERIAL AND METHOD FOR MANUFACTURING SOUND ABSORBING MATERIAL

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CN104175976A (en) * 2014-08-28 2014-12-03 苏州申博汽车零部件有限公司 Acoustic wool processing method
CN105172275A (en) * 2015-09-25 2015-12-23 丹阳市宇晟纺织新材料有限公司 Full-band sound-absorbing needle-punched non-woven composite structure material and preparation method thereof

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Publication number Priority date Publication date Assignee Title
CN104175976A (en) * 2014-08-28 2014-12-03 苏州申博汽车零部件有限公司 Acoustic wool processing method
CN105172275A (en) * 2015-09-25 2015-12-23 丹阳市宇晟纺织新材料有限公司 Full-band sound-absorbing needle-punched non-woven composite structure material and preparation method thereof

Cited By (3)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JP2020106697A (en) * 2018-12-27 2020-07-09 ブリヂストンケービージー株式会社 Sound absorbing structure
CN109825946A (en) * 2019-02-21 2019-05-31 浙江华恒复合材料有限公司 A kind of method of dry process vacuum insulation panel core material
JP7142189B1 (en) * 2021-01-26 2022-09-26 東洋紡株式会社 SOUND ABSORBING MATERIAL AND METHOD FOR MANUFACTURING SOUND ABSORBING MATERIAL

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